3.3 PLC program flow chart The PLC program flow chart is shown in Figure 3: Previous page Aluminum Alloy Handle,Circular Door Handle,Invisible Door Handle,Bathroom Glass Door Handle Zhaoqing Muyi Hardware Products Co., Ltd , https://www.muyihardware.com
4 Control system rationality and reliability design Although the tire mold EDM machine has a small number of measurement and control objects, the mechanical structure is not complicated, but the workbench is large in volume, the moment of inertia is large, and the interference during EDM is very large. To enable it to control tasks with high precision and high reliability, and in order to bring convenience to operators, we have made the following considerations:
(1) Reasonable design of the mechanical part The mechanical part is the controlled object of the control system and is the premise that determines whether the control system can work reliably. We have adopted a worm gear transmission structure with suitable interference fit, which provides conditions for high rotation accuracy and self-locking of the table.
(2) Good human-machine interface touch screen constitutes the human-machine interface to give people a relaxed and eye-catching feeling from the aspects of screen, prompt statement, color, etc. The design of each control screen is based on the principle of centralized control functions, and the operation is simple; on the touch screen It shows various setting parameters and system running status, and the operator can easily understand the working condition of the system and the operation is convenient.
(3) Anti-interference measures of the system The controller of the indexing system uses high-reliability PLC and sensor to ensure the reliability of the system from the equipment; each control cabinet is completely isolated on the circuit, and the analog circuit in each control cabinet Separate shielding measures have also been taken with digital circuits, especially electromagnetic interference from EDM equipment; each control cabinet also has good ventilation and heat dissipation measures.
5 Conclusion herein <br> <br> the tire mold EDM instrument indexing system from August 2002 has been used in multiple sets of equipment, it is equipped with a sub-system of the electric discharge machining apparatus, in the trial During operation and normal operation, regardless of the size, weight and weight of the mold, the indexing system can control the precise indexing of the workbench, and the user response effect is very satisfactory, which has brought great economic benefits.